Re: chips

[shack@deimos.frii.com (Randy Shackelford)]

In article <33B34327.481C@swbell.net>, Rubywand  <rubywand@swbell.net> wrote:
>Adalbert Goertz writes ...
>> 
>> I have an Apple memory expansion card populated with
>> 8x256k chips which are located at
>> columns 4,8,12,16.

See, Adalbert is talking an Apple slinky card, not a IIgs card, as I surmised
elsewhere in this thread.

>> I also have a RAMWorksII expansion card for the iie populated
>> with 16 256k chips which are located at
>> 
>> I like to transfer 256k memory from the RAMWorksII card to my
>> Apple card.
>> I dont have any documentation for the cards.
>> Which chips should I remove from the RAMWorksII card and place them
>> in which columns on the Apple card?
>> Can the Apple card be populatetd with 768k?
>> (I thought I read somewhere that the Apple card works with 256k, 512k or
>> 1024k only, not with 768k).

One caveat is that Apple's cards require CAS/RAS refresh chips and RAMworks
cards do not. I got bittn by this when I first got my IIgs way back in '87
and tried to swap chips off my RAMworks II onto my IIgs memory card. Didn't
work.

>     The standard Apple IIgs 1MB Memory Expansion card can be usefully 
>configured for just 256k, 512k, and 1MB.

Slinkies allow 768K but the bank layout is funky.

>     If the idea is to leave 256k of working RAM on the RAMWorks card, I 
>do not know which 8 chips to pull or which, if any, settings to change.

I'd have to look at my card or manual to remember which is the first bank
on a RAMworks II card myself. I say scare up chips and fill all the cards
up since it's so cheap to do so these days.

>     An alternative is to order a set of 24 41256 mem IC's for the full 
>IIgs mem card upgrade to 1MB from Alltech (619-724-2404). The price 
>(December, 1996) for the set is shown as $24.00.    

Or see my other article for a no buck (almost) way to fill the card.
-- 
Randy Shackelford                                 
shack@frii.com